Hi @Victor_G
Thank you very much . This is not exactly the answer to my question, but I accepted it as a solution because your explantations helped me a lot anyway.
Just in case you want some clarification about my initial objective: In a certain way, what I wanted was to reproduce exactly the profiler in Excel for other people not having JMP. With the predicted formula you can easily create the fitting curve, but I also wanted to include the gray regions that we see in the profiler.
With your explanation I could present things a little bit different, but it also does the job: I plotted actual vs predicted and use the columns with the formula for confidence intervals. (this is slightly different from my objective which is use the original graph and put the fitting curve and confidence interval as the profiler does).
Thank you again, because your solution provides the majority of elements to answer my question.